<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		
		<script>
			
			//1.算数运算符 + — * / % ++ --
			
			//2.字符串谅解 +
			
			//3.关系运算符> >= < <= == === != !==
			
			var a = 123;
			var a = "123";
			console.log(a == b); //  true 不判断类型
			console.log(a === b);// false
			
			//4. 赋值运算
			// = += *= 、= %=
			//5.逻辑运算符
			//&& 与
			// // 或
			// 条件？ 结果1：结果2
			
			var raining = false;
			console.log()
		</script>
	</body>
</html>
